Heat Pump Desuperheater Calculator
Calculate hot water savings from a geothermal desuperheater.
InputsLoading live data…
BTU/hr
%
%
gal
°F
°F
$/kWh
hrs/day
Results
Annual Savings
$476.00
≈ 9 tanks of gas
Hot Water % Met
100%
Desuperheater Output7,200 BTU/hr
Daily HW Energy Need32,487 BTU
Annual kWh Replaced3,658 kWh
Annual Saved (kWh)3,475.31
How to Use This Calculator
- Enter the heat pump's rated heating capacity in BTU/hr.
- Input the desuperheater efficiency percentage.
- Set your annual water heating load in therms or kWh.
- Enter your current water heater energy cost.
- Review the estimated annual water heating savings from the desuperheater.
How the result changes with Hot Water Temp
| Hot Water Temp | Annual Savings | Hot Water % Met |
|---|---|---|
| 104 | $359.00 | 100% |
| 114 | $432.00 | 100% |
| 126 | $519.00 | 100% |
| 136 | $593.00 | 100% |
What each input means
- Heat Pump Capacity
- Total heat pump capacity.
- Desuperheater Output
- Percentage of heat pump capacity available as hot water.
- Water Heater Efficiency
- Efficiency of your current electric water heater.
- Daily Hot Water Use
- Daily hot water consumption in gallons.
- Inlet Water Temp
- Temperature of cold water supply.
- Hot Water Temp
- Target hot water temperature.
- Electricity Rate
- Your electricity rate.
- Heat Pump Run Hours
- Average hours per day the heat pump runs.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersHeat Pump Capacity = 48000, Desuperheater Output = 15, Water Heater Efficiency = 95, Daily Hot Water Use = 60 = 8 input(s) provided
- Calculate Annual SavingsAnnual Savings476 = $476
- Calculate Hot Water % MetHot Water % Met100 = 100
- Calculate Desuperheater OutputDesuperheater Output7200 = 7200
- Calculate Daily HW Energy NeedDaily HW Energy Need32487 = 32487
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